Image: HP Educational Basic optical mark-reader card. Godfrey Manning.
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Description: HP Educational Basic optical mark-reader card. Godfrey Manning.
Title: HP Educational Basic optical mark-reader card. Godfrey Manning.
Credit: Own work
Author: GLMEW
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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